Fix bug in previous checkin


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8922 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index b2b63af..a8234b3 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -1960,6 +1960,7 @@
 
       ++NumConstProp;
       I->getParent()->getInstList().erase(I);
+      removeFromWorkList(I);
       continue;
     }